/Engine/Source/Runtime/Engine/Classes/AI/Navigation/NavLinkDefinition.h
Set up bCustomFlagX properties and expose them for edit
static void DescribeCustomFlags ( const [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > & EditableFlagNames, [UClass](API\Runtime\CoreUObject\UObject\UClass) * NavLinkPropertiesOwnerClass )